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Newbomb Turk What size 2 bbl would you recommend? A 500 two bbl would have bigger barrels than the primaries of the 4 bbl, and not be as responsive as a 4 bbl. But the 4 bbl will have less restriction at high rpm/load.
PS: A 500 2 bbl has the same flow rating as 375cfm 4 bbl when rated at the same pressure drop.